I think Really Right Stuff is terrific and god knows I own enough of it already , but why does no one mention the Nikon PB-6 + film holder as a solution for D3/D3X bodies? Are there incompatibility problems between the size/shape of the body and the camera end of the PB-6? Does the Krogh RRS rig yield better alignment?

Is there a reason these wont work? PB-4? I have heard the "Nikon Reason" which states the incompatibility due to the extra step of the landscape/portrait rotation due to the grip -or- is it due to the electronic contacts? Weird thing is, i have seen the PB-4 rig used on a D90.

I have not tried to put a camera on the PB4. It's possible that it would work. When I was trying this unit out, there was no full-frame camera available (except the Kodak 14n which did not fit on the bellows).

I'm pretty sure I don't have one of those here to test, but, like the PB6, I'm pretty sure it would only work with the D700, if it worked at all.